Barrow, Isaac, Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur

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            <s xml:id="echoid-s16589" xml:space="preserve">UBi (_pag. </s>
            <s xml:id="echoid-s16590" xml:space="preserve">100_) de Centro gravitatis parabolæ & </s>
            <s xml:id="echoid-s16591" xml:space="preserve">para-
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            boliformis verba fiunt, intelligantur non curvæ lineæ,
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            ſed iis comprehenſa ſpatia, de quibus apparet iſthic agi.</s>
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            <s xml:id="echoid-s16593" xml:space="preserve">Sicubi ponitur {δ/π}, nec adponitur εκθεσις ulla, deſignan-
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            tur termini rationem exprimentes, quam habet circuli di-
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            ameter ad ejus circumferentiam.</s>
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